Pad for photograph-printing machines.



No. 858,570. PATENTED JULY 2, 1907.

J. G. CALHOUN.

PAD FOR PHOTOGRAPH PRINTING MACHINES.

APPLICATION FILED SEPT.17. 1906.

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JOSEPH O. CALHOUN, OF HOLLAND, MICHIGAN, ASSIGNOR OF ONE-HALF TO GEORGE P. HUMMER, OF HOLLAND, MICHIGAN.

Specification of Letters Patent.

Patented July 2, 1907.

Application filed September 17. 1906. Serial No. 334,941.

To all whom it may concern:

Be it known that I, JosEPH G. CALHOUN, a citizen of the United States of America, residing at Holland, in the county of Ottawa and State of Michigan, have invented certain new and useful Improvements in Pads for Photograph-Printing Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in pads for photographic printing machines, and more particularly to such machines as shown in my co-pending applica-- tion, Serial Number 317,275, filed May 17, 1906, for photographic printing machines, and its object is to provide an improved pad having a smooth and yielding surface to engage the photographic paper and hold the same in Contact with the negative, and to provide the same with various new and useful features hereinafter more fully described and particularly pointed out in the claims, reference being had to the accompanying drawings, in which:

Figure 1. is a perspective View of a device embodying my invention; Fi 2. a transverse section of the same on an enlarged scale; and, Fig. 3. a perspective View of the sheet metal tray forming a part of the device.

Like numbers refer to like parts in all of the figures.

1 represents a frame of any desired dimensions, within which is a backing plate 2 to support the bottom of a sheet metal tray 3 inserted within the frame and in contact with the backing 2. Within this tray and projecting below the same is a composition of elastic material having a smooth and level under surface projecting somewhat below the frame and tray. This material is preferably made of a mixture of brown glue, or gelatin, water, glycerin, and non drying oil (preferably machine oil) in substantially the following proportions: glue, thirty pounds; glycerin, two and one-half gallons; machine oil, three gallons; and water as required. These are mixed by first soaking the glue in sufiicient cold water to soften the same, melting the glue by the application of heat and then adding the glycerin and oil and intimately incorporating the mixture while fluid.

This mixture while in the fluid state is then poured into the tray and a sufficient surplus retained therein by surrounding the tray with upwardly projecting walls of any suitable material such as paper or pasteboard, which latter are removed after the contents of the tray have become cold. This composition 4 is quite elastic and is preferably covered with a sheet of some non porous and yielding substance 5, such as oilcloth or thin sheet rubber and the edges thereof secured to the frame 1 by suitable fastenings G, such as small tacks. This pad when thus constructed will retain its elasticity for a long time and presents a very smooth and uniformly yielding surface to the paper and having an non-porous surface, imparts no moisture to the paper and admits no gas, air or other vapors to the same.

What I claim is:

1. In a pad for photograph printing machines, a tray and elastic material in the tray and projecting above the edges of the same.

2. In a pad for photograph printing machines, a frame, a tray in the frame, elastic material in the tray, and a backing in the frame to support the bottom of the tray.

3. In a pad for photograph printing machines, a frame, I

a sheet metal tray in the frame, a backing in the frame, and supporting the bottom of the tray, elastic material in the tray, and a non-porous cover for said material and sccured at its edges to the frame.

A pad for photograph printing machines, comprising a frame, a backing in the frame, a sheet metal tray in the frame and supported by the backing, elastic material in the tray and projecting above the edges of the same, and a non-porous covering for said material and attached to the frame.

5. In a pad for photograph printing machines, an elastic material consisting of glue, glycerin, water and oil, substantially as described.

G. In a pad for photograph printing machine, an elastic material consisting substantially of the following ingredients in proportions substantially as follows: glue, thirty pounds; water to soften the glue when cold; glycerin, two and onehalf gallons; and oil, three gallons.

In testimony whereof I aflix my signature in presence of two witnesses.

JOSEPH C. CALHOUN.

Witnesses PALMER A. Jones, Ln'rnnn V. MOUL'I'ON. 

